Stop Out is the automatic closing of a trade when a critical margin level is reached. If there are few active trades on the account, the system closes the one that requires the biggest margin. This function helps to avoid the complete loss of a deposit and protects the balance from negative values.
On the accounts Standard, Swap Free, and Micro the Stop Out level is 40%.
On the accounts ECN Prime, and MT5 the Stop Out level is 80%.